"铁三角"构筑高产高效采煤工作面新格局--高产高效采煤工作面设备选型考察报告
"철삼각"구축고산고효채매공작면신격국--고산고효채매공작면설비선형고찰보고
Investigation Report on the Model Selection of the Machines Equipped on the High-yield and High-efficiency Coal Mining Faces Abroad